904 slipping from 2nd-3rd (with video)

I like the red bands/clutches myself, but I switched from dexron III fluid to atf +3 in my 904, it would slip on the 1-2 shift. Went back to regular dex III and it shifted fine. I have no explanation for this. Is that front band adjusted? Also, you might have a shift overlap issue, It's kinda hard to hear it on the video. Is the tach flaring?
Love your car by the way!